Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0114k&link_type=abstract
American Astronomical Society, SPD Meeting #31, #01.14; Bulletin of the American Astronomical Society, Vol. 32, p.803
Other
Scientific paper
We present mode width, Γ , and mean-square velocity power, < v2 >, derived from all currently processed 108-day GONG time series and discuss their implications for p-mode excitation and damping. Assuming stochastic excitation, we estimate the energy per mode, E, and the energy supply rate, dE / dt. For modes with l = 9 - 150, the mean-square velocity power and the mode energy peak at about 3.15 mHz reaching values of < v2 > ≈ 1.4 ; 103 cm2 s-2 and E ≈ 2.2 ; 1028 ergs. The energy supply rate reaches a maximum value of dE / dt ≈ 2.5 ; 1023 ergs s-1 near 3.6 mHz. The mode width shows the familiar `plateau' between 2.5 and 3.1 mHz with a `dip' near 2.9 mHz, which is strongest for l ≈ 40. This dip is most prominent during solar-cycle minimum and disappears with increasing magnetic activity. The energy supply rate decreases on average by about 2.7%\ from the previous activity minimum to the currently highest level of activity. The solar-cycle variation of dE / dt shows no frequency dependence, which is in marked contrast to the other mode parameters. The mode parameters are adequately represented by power laws in several frequency ranges, for example, dE / dt ~ ν 6.89 +/- 0.07 for 2.4 <= ν < 3.0 mHz and dE / dt ~ ν -5.62 +/- 0.27 for 3.75 <= ν < 4.5 mHz. The solar-cycle variation of these parameters can then be expressed as changes of a few percent in the power-law exponents and multipliers. Our results agree reasonably well with previous studies of BiSON and BBSO data.
Hill F. F.
Howe Rachel
Komm Rudolf W.
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